Safety of ice-strengthened shell structures of ships navigating in the Baltic Sea

doi:10.1201/b10565-6

Cited by 3 publications

(4 citation statements)

References 11 publications

(17 reference statements)

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“…The general theory and specific discussions regarding shells of revolution exposed to uniform load can be found in [10]. Such problems are more particular for submarine or aircraft pressure hull designs with pronounced axial symmetry [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Sophisticated finite strip for vibration analysis of a rotating cylindrical shell

et al. 2018

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Abstract. In this article a two-node finite strip with eight degrees of freedom for free vibration analysis of pre-stressed rotating cylindrical shells is formulated. The circumferential mode shape profiles are described exactly using trigonometric functions. The axial mode shape profiles are approximated by bar and beam shape functions for membrane and bending displacements, respectively. In this way a semi-analytical formulation is facilitated so that the discretization is required only in the axial direction. The developed finite strip is validated by comparisons with analytical results. An excellent agreement is observed both for stationary and rotating shells.

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Section: Introductionmentioning

confidence: 99%

Sophisticated finite strip for vibration analysis of a rotating cylindrical shell

et al. 2018

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“…Therefore, the wave induced hydroelastic response of large container ships becomes an important issue in structural design. Mathematical hydroelastic model incorporates structural, hydrostatic and hydrodynamic parts (Senjanović et al , 2008a(Senjanović et al , 2009b(Senjanović et al , 2010b. Beam structural model is preferable in the early design stage and for determining global response, while for more detailed analyses 3D FEM model has to be used.…”

Section: Introductionmentioning

confidence: 99%

Beam Structural Modelling in Hydroelastic Analysis of Ultra Large Container Ships

Senjanović¹,

Vladimir²,

Hadžić³

et al. 2011

Recent Advances in Vibrations Analysis

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“…This is very important in case of impulsive loads such as ship slamming and induced whipping. Numerical procedure for ship hydroelastic analysis requires definition of structural model, ship and cargo mass distributions, and geometrical model of ship wetted surface [3,5,6,7]. Firstly, dry natural vibrations have to be calculated, and after that modal hydrostatic stiffness, modal added mass, damping and modal wave load are determined.…”

Section: Introductionmentioning

confidence: 99%

“…Usually, the wave load obtained according to these theories is imposed to the elastic 3D FEM model of ship structure in order to analyze global strength, as well as local strength with stress concentrations related to fatigue. Although the above approach is good enough for ships with closed cross-section and ordinary hatch openings such as tankers, bulk carriers or general cargo ships, it is not reliable as it should be for ultra large container ships due to mutual influence of the wave load and structure response [2,3]. Therefore, a more reliable solution requires analysis of wave load and ship vibration as a coupled hydroelastic problem [4].…”

Section: Introductionmentioning

confidence: 99%

Improvements of Beam Structural Modelling in Hydroelasticity of Ultra Large Container Ships

Senjanović

Vladimir

Malenica

et al. 2011

Volume 2: Structures, Safety and Reliability

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Increase in global ship transport induces building of Ultra Large Container Ships (ULCS), which have a capacity up to 14000 TEU with length up to 400 m, without changes of the operational requirements (speed around 27 knots). Natural frequencies of such ships can fall into the range of encounter frequencies in an ordinary sea spectrum. Present Classification Rules for ship design and construction don't cover such conditions completely and hydroelastic analysis of ULCS seems to be the appropriate solution for analysis of their response in waves. This paper deals with numerical procedure for ship hydroelastic analysis with particular emphasis on improvements of the present beam structural model. The structural model represents a constitutive part of hydroelastic mathematical model and generally it can be formulated either as 1D FEM or 3D FEM model. For the preliminary design stage hydroelastic model derived by coupling 1D FEM structural model and 3D BEM hydrodynamic one seems to be an appropriate choice. Within the paper the importance of hydroelastic approach and methodology of hydroelastic analysis are elaborated. Further on, structural model based on advanced beam theory is described in details. The improvements include taking into account shear influence on torsion, contribution of bulkheads to hull stiffness as well as determination of effective stiffness of engine room structure. Along with that, hydrodynamic and hydrostatic models are presented in a condensed form. Numerical example, which includes complete hydroelastic analysis of a large container ship, is also added. In this case, validation of 1D FEM model is checked by correlation analysis with the vibration response of the fine 3D FEM model. The procedure related to determination of engine room effective stiffness is checked by 3D FEM analysis of ship-like pontoon which has been made according to the considered ship characteristics.

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Safety of ice-strengthened shell structures of ships navigating in the Baltic Sea

Cited by 3 publications

References 11 publications

Sophisticated finite strip for vibration analysis of a rotating cylindrical shell

Sophisticated finite strip for vibration analysis of a rotating cylindrical shell

Beam Structural Modelling in Hydroelastic Analysis of Ultra Large Container Ships

Improvements of Beam Structural Modelling in Hydroelasticity of Ultra Large Container Ships

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